Tube-expander.



O. WIEDEKE.

TUBE EXPANDER.

Patented Sept. 14, 1915.

OTTO WIEDEKE, or DAYTON, OHIO,

Assrcrivoa `OroivE-mnur To GUsTAv WTEDEKE, or DAYTON, OHIO.

TUBE-XPADR.

Specification of Letters iatent. 15a, igeted Sep-3, 14k, 1915 Application filed December 12, 1914. Serial No; 876,930.`

To dllfwhom t may concern: Y

Be it known that I, OTTO WIEDEKE, a citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Tube-Expanders; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the artto which it appertains to make and use the samef,rreference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, .which form a part of this specification.

This invention relates to certain new and useful improvements in boiler tube expanders with a special adaptation for belling the end of a tube where 'it joins the tube sheet or head, as in fixing 'the end of the tube in the aperturein the tube sheet or head.

In carrying out the purposes .of the in-` vention, I employ two expanding rollers, one a. roller of uniform diameter and the other a roller of tapered periphery. These rollers 'each having their particular functio'n to perform, are mounted upon a common axial support and are free to move independently of each other, as will hereinafter more fully appear. The tool is insertible in the end of the tube which is placed in the aperture therefor inthe tube sheet or head, the expanding roller of uniform diameter being in a position to properly expand the tube against the surrounding surface of the said tube sheet and the other roller, towit, the tapered roller being in a position to bell or bend outwardly the end of said tube on the outside of the tube sheet. A

A further Object of my invention is to provide a reversible guard and support therefor by means of which the insertion of the tool is gaged to meet Adierent requirements. In carrying out the latter purpose, I provide the roller cage with a tubular extension exteriorly screw-threaded and a correspondingly interiorly screw-threaded sleeve upon which the guard is mounted, the sleeve being insertible in reversed positions on the said screw-threaded extension, as will hereinafter more fully appear from the fol-v lowing description in connection with the accompanying drawings.

Referring to said drawings, Figure 1 is a horizontal longitudinal section of my improved boiler tube expander showing the same in position in a nipple or tube; Fig. 2 is a sectional view on the line d--a of Fig. l; F ig'.` 3 is a section on the line o o of Fig. 1; Fig. isa horizontal elevation of the tube expander showing the guard reversed from the position shown in Fig. 1 and with a portion of the mandrel broken off; Fig. 5 is a sectional view of the expanding rollers removed from the cage.

In a detail description of the invention, similar reference characters indicate corresponding parts in the several views of the drawings.

The roller cage or frame 1 has the necessary number of pockets 2 for housing the expanding rollers in the usual manner. A tubular extension 3 extends from the cage through which the mandrel ft extends. The tubular extension 3 has exterior screwthreads 5 which are engaged by similar internal threads 6, on an adjusting sleeve or collar 7. A slot 8 extends longitudinally in the exterior service of the cage extension 3 and receives the end of a screw 9 which penetrates an opening in the collar 7 and by means thereof the collar 7 is prevented from rotatingon the extension 3; The collar 7 has an annular groove or recess 10 in the periphery thereof, in which is rotatably mounted guard-ring 11.l It will thus be seen that the position of the guard-ring 11 may be reversed to bring one or the other face thereof to a position to gage or limit the insertion of the tool in the tube. As appears in Fig. 1, the annular shoulder or face on the guard is engaged by the end of the nipple or pipe 12, while in Fig. 4, the extreme 'end ,of the said guard is in aposition to' engage that portion of the tube. The nipple or tube is shown in Fig. 1 with an end projected through the tubel aperture in the tube sheet or head 13. The end of the said tube is there shown to be expanded annularly against the surrounding surface of the aperture therein, while the extreme end of said tube is expanded to a greater extent or flared outwardly on one side of said tube sheet. This manner of uniting the end of .the tube to the tube sheet is performed by two distinct forms of expanding rollers 111 and 15 which are mounted together on a single axial support or pin 16. 'Ihe roller 14: is of substantially uniform diameter and is instrumental in expanding the tube unif while roller 15 is `tapered and designed' to bell the extreme end of the tube.

' In order that the belling or tapered roller 15 shall have a necessarily greater extent of lateral movement, the axial opening therein is greater on one side and gradually decreases in size so that said roller will be free" the latter is being forced outwardly by the mandrel. As the mandrel is inserted in the opening it engages the surfaces of the two rollers substantially in the positions in which they are shown in F ig. 5 and as said mandrel is forced 1n the inner surface -of :the helling roller 15 assumes a position in a plane with the surface of thev roller 14,

thus increasing the inclination of the outerY side of said roller 15 with reference to the plane of the boiler tube.

The roller pockets 2 each .open into a longitudinal space 2 in which retaining pins 18 lie and serve to pre* vent thel rollers dropping into the mandrel opening when the mandrel is removed.

While VI have with some particularity described myV improved tool in order to meet the requirements of section 4886 of the Revised Statutes, I do not wish to'be limited YtoV all of the precise details of construction Y herein shown and described, as it will be apparentV to those skilled inthe'art that certain *modifications and variations may be Vmade without departing from the essentials of the invention. F or example, while I deem it important that the helling roller Vand the roller of uniform diameter shall be mounted on a common'axial support and thus be inseparably maintainechfthis axial support may vary to some extent in its form and, too, the'roller cage or framemay be varied in size and possibly in shape without departing from the invention. l'

Having descrbed'my invention, I claim. 1. In a tube expander, the combination Copies of this' patent may be obtained for ve cents each, by ,addressing the VCo with a roller cage, of an expanding roller ofk uniform diameter, and a tapered expanding roller, the axial opening in the tapered rollerbeing of greater area than that of the roller ofuniform diameter, a common axial support for said rollers, and a mandrel engagingsaid rollers to expand a tube and bell the end thereof, substantially as specified. c. .v

' 2. In a vtube expander, the combination with a roller cage, of an expanding'roller of uniform diameter. providedl with ;a convex face, a tapered roller having Van venlarged axial opening therein, a pin upon which both rollers are` mounted and .-maintained,

of ,movementA owingV to itsV greater axial opening, and a mandrel engaging said rollers, substantiallyv as, described.

3. In a tube expander, the combination the tapered: roller having a greater extent with a roller cage, of expanders mounted upon a kcommon pin, Vone of said rollers beingV of tapered form and the opening 1n .the axis thereof being increased outwardly whereby said roller may have greater lateral .movement on. said pin when forced out# wardly, anda mandrel engaging said rollers,

substantially as described. a. Y

4. In a tube expander, the combination lwith a roller cage having 1 an .exteriorly screw-threadedV extension provided with` a longitudinal groove in the exterior surface of said extension, an interiorly screwthreaded collarfengagingV said extension, a guard supported onfsaidcollar, and a screwV penetrating said collar and entering the longitudinal groove in `said extension, of an expanding rollerY of'uniform diameter, and -a tapered roller mounted in saidcage in alinement' one with the other, said; rollers Y being both 'mounted upon acommon pin and said tapered rollerV having its axial `opening of gradually: increasing diameter, substantially as specified. Y

In testimony whereof I affix my signature,

in presence of two witnesses. 'Y

mmissioner of Patents.

Washington, D. C. 

